<template>
    <el-container class="home-container">
      <!-- 头部区域 -->
      <el-header>
        <div>
          <img src="../assets/logo.png" alt="">
          <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout">退出</el-button>
      </el-header>
      <!-- 页面主题区域 -->
      <el-container>
        <!-- 侧边栏 -->
        <el-aside :width="isCollapse ? '64px':'200px'">
          <div class="toggle-button" @click="toggleCollapse">|||</div>
          <!-- 侧边栏菜单区域 -->
          <el-menu
            background-color="#333744"
            text-color="#fff"
            active-text-color="#409EFF" unique-opened :collapse="isCollapse"
            :collapse-transition="false" router :default-active="activePath"> <!-- :default-active="$route.path" -->
            <!-- 一级菜单 -->
            <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
              <!-- 一级菜单的模板区域 -->
              <template slot="title">
                <!-- 图标 -->
                <i :class="iconsObj[item.id]"></i>
                <!-- 文本 -->
                <span>{{ item.authName }}</span>
              </template>

              <!-- 二级菜单 -->
              <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)">
                <!-- 二级菜单的模板区域 -->
                <template slot="title">
                  <!-- 图标 -->
                  <i class="el-icon-menu"></i>
                  <!-- 文本 -->
                  <span>{{ subItem.authName }}</span>
                </template>
              </el-menu-item>
            </el-submenu>
          </el-menu>
        </el-aside>
        <!-- 右侧内容主体 -->
        <el-main>
          <router-view></router-view>
        </el-main>
      </el-container>
    </el-container>
</template>

<script>
export default {
  name: 'Home',
  data: function () {
    return {
      // 左侧菜单数据
      menulist: [],
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  methods: {
    logout () {
      // 清空token
      window.sessionStorage.clear()
      // 重定向到登录页
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
      console.log(res)
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 报错链接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  }
}
</script>

<style lang="less" scoped>
.home-container{
  height: 100%;
}

.el-header{
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div{
    display: flex;
    align-items: center;
    img{
      height: 40px;
      margin-left: 10px;
    }
    span {
      margin-left: 15px;
    }
  }
}

.el-aside{
  background-color: #333744;
  // P32 9：00处弹幕学习，修复导航栏显示bug
  .el-menu{
    border-right: none;
    //border-right: solid 0px #e6e6e6;
  }
}

.el-main{
  background-color: #eaedf1;
}

.iconfont{
  margin-right: 10px;
}

.toggle-button{
  background-color: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
